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Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Revenues From Contract With Customer [Line Items] |  |
Contract asset balances | $ 44 | $ 46
Contract liability balances | 102 | 132
Revenue recognized from contract liability balances | 93 |
Dominion Energy Gas Holdings, LLC |  |
Revenues From Contract With Customer [Line Items] |  |
Contract asset balances | 61 | 66
Contract liability balances | 38 | 41
Revenue recognized from contract liability balances | 40 |
Virginia Electric and Power Company |  |
Revenues From Contract With Customer [Line Items] |  |
Contract liability balances | 20 | $ 50
Revenue recognized from contract liability balances | $ 25 |

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